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A kind of preparation method of lithium-sulfur battery cathode material

A cathode material, lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems of obvious shuttle effect, poor cycle stability, low sulfur load, etc., and achieve the effect of obvious adsorption, loss reduction, and large specific surface area.

Active Publication Date: 2022-08-09
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a lithium-sulfur battery positive electrode material for the problems of low sulfur loading, obvious shuttle effect, and poor cycle stability in the existing lithium-sulfur battery positive electrode materials.

Method used

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  • A kind of preparation method of lithium-sulfur battery cathode material

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Experimental program
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Embodiment 1

[0026] Step 1: Preparation of graphene / vulcanized zinc composite materials:

[0027] 40ml zn (NO 3 Cure 2 · 6H 2 O (0.2mol / L), 40ml in (NO 3 Cure 3 · 3H 2 O (0.2mol / L) and 40ml sulfur (0.2 mol / L) mixed solution uses a magnetic mixer to stir for 30 minutes, add 30 mg of graphene, transfer the mixture to the reactor of the polytrafluoroethylene lining, and the reactor will be Place it in a constant temperature furnace for 120 ° C for 12 hours. Take it out after cooling to the room temperature. Repeat the deodorized water to get the required graphene / sulfide zinc composite material.

[0028] Step 2: Preparation of zinc nitride / nitride / nitrogen doped graphene / sulfide zinc 铟 composite material:

[0029] Place the graphene / vulcanized zinc composite material made in the first step in the pipe furnace. In the atmosphere of the atmosphere, the heating up to 400-600 ° C, the temperature increase rate is 2 ° C / min, and then keeps continuously connected to the pupa. In the condition of enteri...

Embodiment 2

[0033] Step 1: Preparation of graphene / vulcanized zinc composite materials:

[0034] Will 50ml zn (NO 3 Cure 2 · 6H 2 O (0.5mol / L), 50ml in (NO 3 Cure 3 · 3H 2 O (0.5mol / L) and 50ml sulfur (0.5mol / L) mixed solution uses a magnetic mixer to stir for 30 minutes, then add 50mg of graphene, and transfer the mixture to the reactor of polytetrafluoroethylene lining. The kettle is kept 150 ° C for 24 hours in the constant temperature furnace. Take it out after cooling to the room temperature. Repeat the deodorized water to get the required graphene / sulfide zinc composite material.

[0035] Step 2: Preparation of zinc nitride / nitride / nitrogen doped graphene / sulfide zinc 铟 composite material:

[0036]Place the graphene / vulcanized zinc composite material made in the first step in the pipe furnace. In the atmosphere of the atmosphere, the heating rate is 5 ° C / min, and then it is maintained by keeping the sorbe. The ammonia gas is started under the conditions. The ratio of the flow rate of t...

Embodiment 3

[0040] Step 1: Preparation of graphene / vulcanized zinc composite materials:

[0041] 30ml zn (NO 3 Cure 2 · 6H 2 O (0.1mol / L), 30ml in (NO 3 Cure 3 · 3H 2 O (0.1mol / L) and 30ml sulfur (0.1mol / L) mixed solution with a magnetic mixer stir for 10 minutes, then add 10 mg of graphene, and transfer the mixture to the reactor of the polytrafluoroethylene lining. The kettle is placed at 100 ° C for 12 hours in the constant temperature furnace. Take it out after cooling to the room temperature. Repeat the deodorized water to get the required graphene / sulfide zinc composite material.

[0042] Step 2: Preparation of zinc nitride / nitride / nitrogen doped graphene / sulfide zinc 铟 composite material:

[0043] Place the graphene / vulcanized zinc composite material made in the first step in the pipe furnace. In the atmosphere of the atmosphere, the heating rate is 1 ° C / min, and then it is maintained by keeping the sorbe. The ammonia gas is started under conditions. The proportion of pantomy and ammo...

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Abstract

The invention relates to a method for preparing a positive electrode material for a lithium-sulfur battery. The method firstly prepares a zinc-indium sulfide-graphene composite, and then performs nitridation to obtain a composite product as a positive electrode material for a lithium-sulfur battery. The preparation method can maintain the original zinc indium sulfide flower-like structure, has a large specific surface area, is conducive to the rapid transfer of electrons, and has more active contact sites. Lithium sulfide has obvious adsorption effect, which can reduce the loss of positive active material, and nitride has obvious effect on the conductivity improvement of the overall electrode material.

Description

Technical field [0001] The present invention involves a preparation method of a lithium-sulfur battery positive electrode material, which specifically involves a pre-prepared zinc-graphene composite material, and then the preparation method of nitride is nitride, which belongs to the field of material chemistry. Background technique [0002] Chemical batteries, also known as chemical power supply, directly transform the energy generated by chemical reactions into low -voltage DC power energy. With the advancement of science and technology and the rapid development of society, people's demand for chemical power supply is increasing. Compared with traditional secondary batteries, such as lead -acid batteries, cadmium nickel batteries, and nickel -metal hydride batteries, lithium -ion batteries have higher capacity and energy density, and are currently the most widely used chemical power supply. However, the energy density of commercial lithium ion batteries today is of traditional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/362H01M4/5815H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV